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  1. ; (, SIAM Journal on Applied Mathematics)
    While the hexagonal lattice is ubiquitous in two dimensions, the body centered cubic lattice and the face centered cubic lattice are both commonly observed in three dimensions. A geometric variational problem motivated by the diblock copolymer theory consists of a short range interaction energy and a long range interaction energy. In three dimensions, and when the long range interaction is given by the nonlocal operator $$(-\Delta)^{-3/2}$$, it is proved that the body centered cubic lattice is the preferred structure. 
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